660648487 has 8 divisors (see below), whose sum is σ = 695802800. Its totient is φ = 625532544.

The previous prime is 660648479. The next prime is 660648491. The reversal of 660648487 is 784846066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660648487 - 2³ = 660648479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 660648487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660648887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29983 + ... + 47119.

It is an arithmetic number, because the mean of its divisors is an integer number (86975350).

Almost surely, 2^660648487 is an apocalyptic number.

660648487 is a deficient number, since it is larger than the sum of its proper divisors (35154313).

660648487 is a wasteful number, since it uses less digits than its factorization.

660648487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19185.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The square root of 660648487 is about 25703.0832197229. The cubic root of 660648487 is about 870.9438327908.

The spelling of 660648487 in words is "six hundred sixty million, six hundred forty-eight thousand, four hundred eighty-seven".